kc3-lang/libtommath

diff --git a/demo/mtest_opponent.c b/demo/mtest_opponent.c
index 7fbd35e..e77fec9 100644
--- a/demo/mtest_opponent.c
+++ b/demo/mtest_opponent.c
@@ -6,7 +6,7 @@
 #define LTM_MTEST_RAND_SEED  23
 #endif
 
-static void draw(mp_int *a)
+static void draw(const mp_int *a)
 {
    ndraw(a, "");
 }
diff --git a/demo/shared.c b/demo/shared.c
index e47e481..4e98808 100644
--- a/demo/shared.c
+++ b/demo/shared.c
@@ -1,6 +1,6 @@
 #include "shared.h"
 
-void ndraw(mp_int *a, const char *name)
+void ndraw(const mp_int *a, const char *name)
 {
    char *buf = NULL;
    int size;
diff --git a/demo/shared.h b/demo/shared.h
index 4d5eb53..14818ac 100644
--- a/demo/shared.h
+++ b/demo/shared.h
@@ -17,5 +17,5 @@
 #define MP_WUR /* TODO: result checks disabled for now */
 #include "tommath_private.h"
 
-extern void ndraw(mp_int* a, const char* name);
+extern void ndraw(const mp_int* a, const char* name);
 extern void print_header(void);